When I use a webview and also use webView.getSettings().setUseWideViewPort(true); to make sure the video fits to screen, the controls on the player go tiny. If I try to set it manually without setting use wideviewport then the controls go huge. So either way it’s difficult for the user.
The other thing with the webview in Android is some devices just don’t work well with it. The video also sometimes lags and freezes for a while.